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在氟的减色比色法测定中,二甲酚橙—锆具有较高的灵敏度,可用于黄铁矿中微量氟的测定,由于黄铁矿中除了含有大量硫外,还存在着一定量的二氧化硅、铝等杂质,在比色测定前,一般均需分离,常采用蒸馏分离和热解分离,但由于装置复杂,手续冗长。为免除蒸馏操作,也有用氢氧化钠或氢氧化铵沉淀分离。本文研究了用碳酸铵分离的条件,矿样经过氧化钠熔融后,以10％碳酸铵溶液浸取,取出上层清液,用二甲酚橙—锆比色法测量,效果良好,在二氧化硅大于三氧化二铝量时(一
In the subtractive colorimetric determination of fluorine, xylenol orange-zirconium has high sensitivity and can be used for the determination of trace fluorine in pyrite. Since pyrite contains a large amount of sulfur in addition, there is a certain amount Of silica, aluminum and other impurities, before the colorimetric determination, generally need to be separated, often using distillation separation and pyrolysis separation, but due to the complexity of the device, lengthy procedures. In order to avoid the distillation operation, it is also separated by precipitation with sodium hydroxide or ammonium hydroxide. In this paper, the conditions for the separation with ammonium carbonate were studied. After the ore sample was melted by sodium oxide and leached with 10% ammonium carbonate solution, the supernatant was removed and measured by xylenol orange-zirconium colorimetric method. The effect was good. Silicon is greater than the amount of aluminum oxide (a